Code builds, tests pass.

src/main/java/com/techreturners/cats/Cat.java

@@ -1,5 +1,101 @@
 package com.techreturners.cats;
 
+import java.util.Random;
+
 interface Cat {
 
+    boolean isAsleep();
+    void goToSleep();
+    void wakeUp();
+    String getSetting();
+    int getAverageHeight();
+    String eat();
+
+}
+
+abstract class GenericCat implements Cat {
+    private boolean isAsleep = false; // awake by default
+    private int averageHeight = 0; // in cm
+
+    String setting = "domestic";
+
+    protected void setAverageHeight(int height) {
+        averageHeight = height;
+    }
+
+    protected void setConditioning(String wildOrDomestic) {
+        setting = wildOrDomestic;
+    }
+
+    @Override
+    public boolean isAsleep() {
+        return isAsleep;
+    }
+
+    @Override
+    public void goToSleep() {
+        isAsleep = true;
+    }
+
+    @Override
+    public void wakeUp() {
+        isAsleep = false;
+    }
+
+    @Override
+    public String getSetting() {
+        return setting;
+    }
+
+    @Override
+    public int getAverageHeight() {
+        return averageHeight;
+    }
+
+    abstract public String eat();
+}
+
+
+class DomesticCat extends GenericCat {
+
+    Random random = new Random();
+
+    DomesticCat() {
+        super.setAverageHeight(23);
+        super.setConditioning("domestic");
+
+    }
+
+    public String eat() {
+
+        int x = random.nextInt(10);
+        if (x < 3)
+            return ("It will do I suppose");
+        // else
+        return ("Purrrrrrr");
+    }
+
+}
+
+class LionCat extends GenericCat {
+
+    LionCat() {
+        super.setAverageHeight(1100);
+        super.setConditioning("wild");
+    }
+    public String eat() {
+        return ("Roar!!!!");
+    }
+
+}
+
+class CheetahCat extends GenericCat {
+    CheetahCat() {
+        super.setAverageHeight(12);
+        super.setConditioning("wild");
+    }
+    public
+    String eat() {
+        return ("Zzzzzzz");
+    }
 }

src/test/java/com/techreturners/cats/CatTest.java

@@ -2,28 +2,29 @@
 
 import org.junit.jupiter.api.Test;
 import static org.junit.jupiter.api.Assertions.*;
+import java.util.Arrays;
 
 public class CatTest {
 
     @Test
     public void checkCatIsAwake() {
         Cat domesticCat = new DomesticCat();
-        assertFalse("Cat should be awake by default", domesticCat.isAsleep());
+        assertFalse(domesticCat.isAsleep(), "Cat should be awake by default");
     }
 
     @Test
     public void checkCatCanGoToSleep() {
         Cat domesticCat = new DomesticCat();
         domesticCat.goToSleep();
-        assertTrue("Cat should be snoozing", domesticCat.isAsleep());
+        assertTrue(domesticCat.isAsleep(), "Cat should be snoozing");
     }
 
     @Test
     public void checkCatCanWakep() {
         Cat domesticCat = new DomesticCat();
         domesticCat.goToSleep();
         domesticCat.wakeUp();
-        assertFalse("Cat should be awake now", domesticCat.isAsleep());
+        assertFalse(domesticCat.isAsleep(), "Cat should be awake now" );
     }
 
     @Test
@@ -60,6 +61,8 @@ public void feedTheCheetah() {
     @Test
     public void feedTheCat() {
         Cat domesticCat = new DomesticCat();
-        assertEquals("Purrrrrrr", domesticCat.eat());
+
+        assertTrue(Arrays.asList("Purrrrrrr", "It will do I suppose").contains(domesticCat.eat()));
+
     }
 }